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"This is a betrayal by Minister Andrew Constance," Chris Prestons, the Secretary of the RBTU, said.

"He will have to wear the consequences of leaving these workers without any job security."

Drummoyne is the only Liberal electorate in Region Six; the rest are held by Labor or the Greens.

"They're punishing people for voting Labor. They're not doing it in their heartland," NSW Opposition Leader Luke Foley said.

Liberal Member for Drummoyne John Sidoti refused to comment on the plan. It is understood he supported privatisation behind closed doors, as long as it improves and increases bus services in his electorate.

Northern Beaches MPs Brad Hazzard and Rob Stokes are said to have pushed back on a private operator running the new B-Line on the Northern Beaches because they didn't want a fight with the unions.

The $500 million project will see buses running every five minutes from Mona Vale to Neutral Bay.

9NEWS understands Mr Constance intends to sign the contract over to State Transit.